Which chart should be used to present the causes of complaints?

Using a Pareto Chart to present the causes of complaints is the most appropriate choice because this specific type of chart is designed to visualize the frequency or impact of problems in a way that highlights the most significant factors contributing to an issue. The Pareto principle, often referred to as the 80/20 rule, suggests that a small number of causes often lead to a large percentage of problems. By utilizing a Pareto Chart, one can easily identify which complaints are most frequent or have the most considerable effect. This helps prioritize resources and efforts towards addressing the most critical issues.

In contrast, other diagrams such as a Run Chart primarily track changes over time rather than focusing on categorizing and analyzing specific causes; thus, they are less effective for this purpose. A Scatter Plot is beneficial for examining relationships between two variables, but it does not organize causes in a way that facilitates understanding complaint distribution. Similarly, a Line Graph is mainly used to display data trends over time rather than to categorize issues based on frequency or severity. Therefore, the Pareto Chart stands out as the best tool to analyze and present the causes of complaints effectively.